Exhaust-steam injecton



Oct. 7, 1924.

R. D. METCALFE ET AL EXHAUST STEAM INJECTOR Filed Nov 5, 1923 9 Sheets-Sheet l Fig.1

.Ituueitfils 17m emzf JC.1ZeicaZ/fe Oct. 7, 1924. 1,510,999

R. D.-METCALFE ET AL EXHAUST STEAM INJECTOR Filed Nov. 5. 1923 9 Sheets-Sheet 2 T H I l 29 *7' 4:0

*5 J(i l l i l 2.1

\ x l A O 1 I Q) Q I v I g \J k g L L i I 3 v n [t T" 9 L l R J 1:

Fig.2

ilitzveltlvfl 'D.mzm,z1e

Oct- 7, 1924. 1,510,999

R. D. METCALFE ET AL EXHAUST STEAM INJECTOR Filed Nov. 5, 1923 9 Sheets-Sheet Fig.4

. TZe 'Zvw Lie,

Oct. 7. 1924. 1,510,999

R. D. METCALFE ET AL EXHAUST STEAM INJECTOR Filed Nov. 5. 1923 9 Sheets-Sheet 4 Oct. 7, 1924.

R. D. METCALFE ET AL EXHAUST STEAM INJECTOR Filed Nov. 5. 1923 9 Sheets-Sheet 5 7,1111, 0.216121%? 2 1). llctc all/f9 J C 1e%calfe R D.METCALFE ET AL EXHAUST STEAM INJECTOR Filed Nov. 5 1923 9 Sheets-Sheet 6 vuenibl'ks lllfleicalfe J C 126 Z-ca/Zfe $3 77% 2%.

Oct. 7, |924- 1,510,999

R. D. METCALFE ET AL EXHAUST STEAM INJECTOR Filed Nov. 5, .1923 9 Sheets-Sheet 8 u m 33 llleflc a Lfe J C ZHe"Z'ca/ Lisa :8 We

R. D METCALFE ET AL EXHAUST STEAM INJECTOR 9 Sheets-Sheet 9 Filed Nov. 5 1923 Jcul ekralfe IE M Oct. 7, 1924.

Patented Oct. 7, 1924.

UNITED STATES PATENT OFFICE.

RICHARD DAVID METCALFE AND JAMES CROXON METCALFE, OF ROMILEY, ENGLAND.

EXHAUST-STEAM INJECTON.

Application filed November To all whom it may concern:

Be it known that we, RICHARD DAVID MnToALri: and JAMES CROXON METCALFE, subjects of the King of Great Britain and Ireland, and residents of Romiley, in the county of Chester, England, have invented certain new and useful Improvements Relating to Exhaust-Steam Injectors, of which the following is a specification.

This invention relates to injectors worked by exhaust steam, or steam at about atmospheric pressure assisted by live steam when it is desired to raise the injector delivery pressure to an amount greater than that obtainable by the use of exhaust steam only.

The object of the present invention is to provide improved means for regulating or controlling the injector so that the operator can by suitable movements of one or more handles which can be placed close together and at a considerable distance from the injector, make all the adjustments necessary to obtain satisfactory working under all conditions.

The invention comprises the combination with an exhaust steam injector, of steam 0perated exhaust steam and water control valves arranged for remote control in proper iequence from a single handle or its equivaent.

The invention further comprises the combination with the single control handle, of means whereby it also controls the live steam supply to the injector for raising the delivery pressure of the latter.

The invention further comprises the combination with the control handle, of pilot and main steam valves operated from said handle for controlling the live steam supply to the injector.

The invention further comprises the combination with the control handle and with the means operated thereby for controlling the exhaust steam inlet valve of the injector, the water inlet valve and the live steam supply valve or valves, of a further valve operated by said handle and adapted to control the flow of steam to the means supplying to the injector live steam throttled down to about atmospheric pressure for working 5, 1923. Serial No. 672,981.

tlklfi injector when exhaust steam is not availa e.

Our invention further comprises the improved details of construction and arrangement hereinafter described and claimed.

Referring to the accompanying sheets of explanatory drawings Figure 1 is a front elevation and Figure 2 a side elevation of an exhaust injector control fitting constructed in one convenient form in accordance with our invention.

Figure 3 is a sectional elevation, Figure 4 a sectional plan view on the line A B of Figure 3, Figure 5 a sectional elevation on the line C D of Figure 3, Figure 6 a sectional elevation ,on the line E F, Figure 3, and Figure 7 a detail view illustrating the details of the construction of the control fitting shownrin Figures 1 and 2.

Figure 8 shows in sectional elevation the injector water inlet valve which is controlled from the instrument illustrated in Figures 1 to 7.

Figures 9 and 10 illustrate in sectional elevation, two arrangements controlled from the instrument shown in Figures 1 to 7 tor regulating the admission of exhaust steam to the ex aust injector.

Figure 11 is a sectional side elevation, Figure 12 a sectional plan view on the line X X of Figure 11 and Figure 13 a front elevation of a modified construction of control fitting.

Fi urc 14 is a sectional end elevation on the hue Y Y of Figure 11.

Fi ure 15 is a sectional end elevation on the line Z Z of Figure 11.

Figure 16 is a view illustrating -an exhaust injector with our improved control arrangements applied thereto.

The same reference letters in the different views indicate the same or similar parts.

Referring in the first place to Figures 1 to 10, the handle a is adapted to control the opening and closing of the valve b (Figures 9 and 10) by which exhaust steam is allowed to pass into an injector, the valve 0 (Figure 8) by which water is admitted to the injector, the valve d and its pilot valve 0, by which live steam is admitted to the injector by way of the passage f (Figures 2 and 4) when the steam is to pass into the injector under full boiler pressure so as to assist in raising the injector delivery pressure and in the form illustrated in Figures 11 to 15 by way of the passage 9 (Figures 11, 12 and 14) when the steam is to be throttled down so that it can act in substitution of the exhaust steam when a supply of the latter is not available. The steam enters the control fitting at It.

The valve 6, Figure 9, slides upon a stem 2' and can abut against a piston j within a cylinder to which steam is supplied by a passage m adapted to be placed in pipe communication with the connection 71. (Fig ures 2 and 6) of the control fitting. The supply of steam to the connection is obtained by way 01' the passage 0, Figure 3, and the disc type valve'p. A drain connection g with a valve 1' thereon which is held open by a light spring so that it 01086:, immediately steam'is admitted to the cylin der is from the passage in ensures the chicient draining of the said cylinder. The drainage merely passes into the main con duit s by which exhaust steam passes into the injector. The valve 6, when not loaded by steam pressure acting on the piston 7', opens by reason of the pressure of the exhaust steam acting thereon if a supply of such steam is available.

In the arrangement shown at Figure 10, a ball type drain valv r is provided within the piston j, the drainage passing by way of the gaps t in the piston end into the exhaust steam passage 5-.

The water control valve 0, Figure 8, is held on its seat by the spring u and opened by the pusher T) when steam is admittcd below the piston to. or is a drain connection for the chamber y. The steam Supply to the underside of the piston w is obtained by Way of the connection 2, Figures 2 and 6. The control of the steam supply is effected by the disc valve 11.

There is an atmospheric connection 3 Figures 2, 3 and 6, between the steam connectiofifs n and at The disc valve has therethrough two ports t and 5 and a lon re cess 6 (see Fig. 7) whilst the seat over w iich the disc moves has therein three ports 7, 8, 9 (see Figure 6) leading to the connections 2, 3 and 91. before referred to. A nonreturn valve 10 on the atmospheric connection 3 prevents any inflow of air to the con trol instrument.

The spindle 11 which carries the disc valve 2 and is turned by the handle a, has a crank arm 12 thereon, the pin, 13 of which can engage the hooked lower end of the stem 14. The upper end of the latter serves to open the steam valve (i whilst the small diameter end 15 of the stem serves to open the pilot valve c slightly in advance ol' the opening of the valve (I.

The handle (I has a pawl 10 thcrcon which co-acts with a iixcd ratchet platc IT. The

pawl is operated by the trigger arm l8.

The operation of the instrument is as t'ollows:- g

lVith the handle (L in the position shown in Figure 2,'the steam valve (l and its pilot valve 6 are on their seats, the port 5 in the disc valve 79 is in conununication with the port 9 So that steam is passing to the cylinder it (Figure 9 or Figure 10) and hol(ling the valve 7! on its seat. the port T is in communication with the port R by way of the recess (3 in the valve disc so that the chamber 1] beneath the piston w is under.

atmospheric pressure and the water control valve 0 consequently closed. When the handle a moves to the position 20, Figure 2, theport 4 comes into coincidence with the port 7 so that steam flows to the water valve control fitting (Figure 8) and opens the said valve, the exhaust steam valve 1) still re maining closed. \Vhcn the handle it reaches the position21, the pilot steam valve 0 is commencing to open and steam flows therethrough into the injector by way of the passage f. Suclr steam draws the feed water into the injector. The feed water valve 0 remains open and the exhaust steam valve 7! closed. \Vhcu the handle reaches the position 22, the port 9 commences to come into communication with the atmospheric port 8 by way of the recess 6 in the disc valve and therefore the valve b (Figures 9"or 10) will commence to open. Further movement of the handle a to the position 23 causes the opening of the main steam' valve d and with the handle a at the position 24, the main steam valve (l is fully open. If there is no exhaust steam available, the valve controlled by the handle 25 is opened which allows live steam throttled down to about atmospheric pressure to enter the injector to take the place of exhaust steam in the known manner.

In the arrangement illustrated at Figures 1]. to 15, we provide forthe operation ofthe valve which controls the supplyof throttled down live steam to the injector by the handle a. As will be seen by reference to Figure 11, there is a steam valve 26 operated by a stem 27 from a crank arm 28 on the spindle 11, in additionto the valve d previously described. The pilot valve e is not employed in the Figure 11 construction. In the latter, the valve 26 is adapted to be opened by the handle a after the valve d has been fully opened. The steam branches f and 9 may each be provided with a stop valve 29, 30, see Figures 14 and 15, or the. stop valve may be fitted on the pipe connections to said branches.

It will be understood that the steam which passes through the conduit g is reduced in pressure by the automatic reducing valve usually provided for the purpose. In the form of instrument illustrated in Figures 1 and 2, the automatic reducing valve is controlled by the handle 25. Such valve, may, however, be arranged in any convenient po sition between the control instrument and the injector.

In Figure 16, the various branches from the control fitting illustrated in Figures 1 and 2 are shown coupled up to the injector which comprises a delivery nozzle 31, a combining nozzle 32 and having a flap 38 thereon, cones 34, 35 and 36 through which the jet issues, a water inlet 37, a supplementary live stean. inlet nozzle 38 and an annular space 39 around the nozzle 38 for the admission of live steam throttled down to about atmospheric pressure. The water control fitting illustrated in Figure 8 is shown at 40.

'e may vary the details of the injector control means to-suit any particular requirements.

\Ve claim 2- l. The combination with an exhaust steam injector, of steam operated exhaust steam and water valves for controlling the supply of exhaust steam and of water to the injector and a manually operable member adaptcd to control the steam supply to the steam operated means whereby remote control of the injector is effected, as set forth. 7

2. The combination with an exhaust injector having the control apparatus claimed in claim 1, of means whereby the control member also controls the live steam supply to the injector for raising the delivery pressure of the latter, as set forth.

3. The combination with an exhaust injectorhaving the control apparatus claimed in claim 1, of pilot and mam steam valves and means for operating the same from the control member, wherebyl the exhaust steam and water supplies of t e injector are controlled, as set forth.

4. The comb'nation with an exhaust injector having the control apparatus claimed in claim 1, of pilot and main steam valves, means for operating the same from the control member whereby the exhaust steam and water supplies of the injector are controlled, and means whereby the control member also controls the supply of steam for working the injector when exhaust steam is not available, substantially as and for the purposes set forth.

, 5. In ex iaust injectors having exhaust steam and water inlet valves operated by steam pressure, an improved injector con-- trol device comprising a rotatable spindle, a handle secured upon. said spindle, a disc type valve carried by said spindle and having ports therein for placing the steam supply connections to the exhaust steam and water valve operating means in communication with the steam supply or with the exhaust, a valve for supplying live steam to the injector for increasing its delivery pressure, and means carried by said spindle for operating said live steam supply valve, as set forth.

6. An apparatus as claimed in claim 5 wherein means are provided for supplying steam to the injector to take the place of exhaust steam when the latter is not available, as set forth.

In testimony whereof we have signed our names to this specification.

RICHARD DAVID METCALFE. JAMES CROXON METCALFE. 

